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a fost răspuns

Calculati:
sin10° x cos20° + sin20° x cos10°

Răspuns :

e o formula :
sin ( a+b)=sin a*cosb+sin b*cos a
=> sin10*cos20+sin20*cos10=sin (10+20)=sin 30=1/2
Hell0
sin10° * cos20° + sin20° * cos10°

cos(s)*sin(t) + cos(t)*sin(s) = sin(s+t)

sin10° * cos20° + sin20° * cos10°=
sin(20°+10°)=
sin(30°)= 1/2

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